Season 1

Kazushi, a university student living alone, is troubled by the presence of two childhood friends, sisters, who hang out all the time at his apartment.

That night after their secret affair in the bathroom, Kazushi is unable to sleep due to excitement and feelings of guilt. While Kazushi is like that,

The day after a depraved night with his sisters, Kazushi is walking along, reflecting on the events of the previous night, when Ayane, with whom he n

"Huh... you were lonely without me...?" Ayane and Kazushi are finally alone at the sports festival, where they go to cheer on their sisters, and the

"Because you're like family to me... I can always be by my big brother's side," Kotone mutters sadly as she steals Kazushi's lips. As the sports fes

Kazushi and the Shirakawa sisters decide to go to the pool on the substitute day off for the sports festival. Ayane, who has been tasked with prepari

"My swimsuit is... gone!?" Kotone's bikini falls off the moment she slides down the water slide at the pool. Kazushi quickly hides her chest and run